Intermittent-driving mechanism



July 2, 1929. z I 1,719,613

"INTERMITTENT DRIVING MECHANISM Filed May 11, 1927 M mvmrox BY j : Patented July 2, 1929.

UNITED STATES max nonnna, or LIMBACH, GERMANY.

INTEBMITTENT-DRIVING MECHANISM:

Application filed May 11',

The present invention relates to an im provcment in intermittent drives. f One ob- Ject has been to provide a device which may he elfectivel used for driving a shaft intermittently a" liigh speed, as, for example, a shaft for actuating the cylindrical feed cups of overscaming machines, although it is contemplated that the improved feed will be found advantageous in connection with other machines in which similar operating conditions are found. The high speed at which overseaming machines operate necessitates simplicity and compactness of construction to reduce, in so far as possible. the number and weight of moving parts, and particularly those which are subjected to reci u'ocative or oscillative movement.

A further object has been to provide an intermittent drive in which there will be notributed over a substantial surface and the position of the worn parts is automatically readjusted to counteract the wear thereof.

One embodiment of my invention is'illustratedin the accompanying drawings in which Figure 1 is a bottom plan view with a portion of the cover plate removed,

Figure 2, a central "ertical section on the line 22 of Figure 1, and

F igure3, a detail section on the line 33 of Figure 1. Referring to the drawings, a fixed ring 1 is secured to framework 2, as, for example, that of an overseaming machine of the well known cylindrical cup feed type. A shaft 3 to be intermittently driven is journaled in said framework and extends centrally through said ring 1. A detent carrier comprising disc 4, secured to shaft 3 by means of a screw 5 is provided on one side with means for presenting braking detent means in effective engagement with the interiorly disposed annu-,

lar surface of ring 1 and on the other side with means for presenting dr1vmg means in effective engagement with the interiorly (115-. posed annular surface of a reciprocative ring I 1927. Serial No. 190,477.

positioned in the wider ends of recesses 10 and driving roller detents 14 are positioned in the wider ends of recesses 12, being retained therein by means of a cover-plate 15 secured to the detent carrier by means of screws 16. As indicated in Figure 3, a bolt 17 extends through the portion 9 and disc 4 and into the portion 11 so that, in operation, these parts, together with the cover plate 15, are actuated as a single unit which rotates with positive or forward movement of the reciprocative ring 6 and remains unmoved during the return or reverse movement thereof.

Inasmuch as the braking and drivingdetent rollers and their mountings are identical in construction, the following further description thereof will be aided by reference only to the driving detent means. The roller detent 14, shown in Figures 1 and 2 as cylindrical in form, is positioned so that under some conditions of operation it may readily be wedged between the inner surface, of ring 6 and the bottom wall of recess 12. The detent 14 is normally yieldingly retained in said position by means of a spring pressed-plunger 18 mounted in a recess 19 extending through the wall of the deeper end of said recess 12 and housing a spring 20 adapt-ed to engage and press said plunger normally toward and into effective engagement with detent 14.

In operation, to impart positive or operative movement of rotation to the shaft 3, endwise movement of rod-7 in the direction indicated by the arrow, Figure 1, is transmitted to ring 6 which moves counterclockwise and wedges the driving detents 14 between 1ts interior annular surface and the rear surfaces of the recesses 12 so that the movement ofsaid ring is communicated to disc 4 and shaft 3. At the same time, thebraking detents 13, yielding toward plungers 21, move in a counterclockwise direction in rolling contact with the interior annular surface of the fixed or brakingring 1 and without resistance to rotation of the shaft 3. Reversin the direction of endwise movement of rod ring 6 will move in a clockwise direction with respect to disc 4, the driving detents 14 yielding toward plungers 18 and freely rolling on the interior annular surface of said ring, and the braking detents 13 will be wedged between the interiorly disposed annular surface of fixed ring 1 and the rear .faces of recesses 10 to prevent clockwise rotation of disc 4 and shaft 3.

The mechanism hereinabove described provides an effective intermittent movement which is particularly adapted to resist wear under extremely rigid conditions of operation, such for example as obtain in connection with the use of some types of overseaming machines operating at a rate to produce more than 2500 stitches per minute with a corresponding number of intermittent movements of the work feed mechanism. It will be apparent that wear on the roller detents 13 and 14 will be evenly distributedover their surfaces and, as the diameter of the rollers tioned at one side of said fixed ring, both rings being mounted concentrically with said shaft, a detent carrier secured to said shaft and within said rings and having a recess positioned to present an openin toward the inner annular surface of the fixe ring and a recess positioned to present an opening toward the inner annular surface of the oscillatable ring,

' a spring pressed roller in each of said recesses and extending through the opening thereof into contact with said inner annular surfaces of said respective rings, and a retaining plate secured to said detent carrier and engaging a side of said oscillatable ring to retain the same in effective operative relation to said carrier. v

2. An intermittent drive comprising a shaft, a fixed ring, an oscillatable ring sitioned at one side of said fixed ring, oth rings being mounted concentrically with said shaft, a detent carrier secured to said shaft and within said rings and having a recess positioned to present an opening toward the inner annular surface of the fixed ring and a recess positioned to present an opening toward the inner annular surface of the oscillatable ring, a spring pressed roller in each of said recesses and extending through the opening thereof into contact with saidinner annular surfaces of 'said respective rings, and a retaining plate secured to said detent carrier and engaging a side of said oscillatable ring to retain the same in effective operative relation to said carrier, said recesses being so positioned and proportioned that during os- (-illatiou ofthe oscillatable'ring in one direction one of said rollers will be wedged between said ring and an interior surface of said reccss while the other of said rollers will move in rolling contact with the fixed ring.-

3. An intermittent drive comprising a shaft, a fixed ring concentric therewith,- an oscillatable ring concentric with said shaft and slidably engaging a lateral face of said fixed ring, a collar secured to said shaft and having a peripheral recess openin toward the inner annular surface of said xed ring and a peripheral recess opening toward the inner annular surface of the oseillatable ring, each of said recesses being of progressively varying-depth from one end to the other, a roller in each recess, and spring means posi-' tioned to normally press each roller toward the shallowerend of its recess.

In testimony whereof, I have signed my name to this specification this 21 day of April,

1 MAX KOHILER. 

